This Chamberlian 850CB compatible mini key chain remote control made by Transmitter Solutions will work with any Chamberlain Billion Code Series Garage Door or Gate Opener that operate on the 390 Mhz radio frequecy. This includes Chamberlain operators made between 1993 and 1997 that have a GREEN learn button. The remote can control one garage door or gate opener.

This unit is compatible with operators using the following Chamberlain 850CB, 853CB, and 856CB